Bed mesh makes first layer worse

This is a know and unfortunately unsolved topic: See Experimental mesh leveling changes

To sum it up:

  • Known to exist
  • So far no systematic error in the compensation logic has been identified
  • There are user reports who have successfully solved their issue. In all cases it has been mechanical issues (twisted / bent extrusion profiles) that lead to a non linear deviation between probed point and nozzle coordinates

In addition there is a first attempt to solve such issues via software: [Testers needed] X twist compensation